Bolt and nut lock.



Patented Aug. 1o, 1909.

UNITED STATES PATENT OFFICE.

CHARLES ZINOW, OF DETROIT, MICHIGAN, ASSIGNOR OF ONE-HALF TO LOUISSOLOMON,

OF DETROIT, MICHIGAN.

BOLT AND NUT LOCK.

To all whom 'it may concern:

Be it known that I, CHARLES ZINow, a citizen of the United States ofAmerica, residing at Detroit, in the county of Wayne and State ofMichigan, have invented certain new and useful Improvements in Bolt andNut Locks, of which the following is a speci-V fication, reference beinghad therein to the accompanying drawings.

The invention relates to a construction of bolt and lock nut andconsists in certain novel features as hereinafter set forth.

In the drawings Fgure 1 is a perspective view of the bolt and nutdetached; Fig. 2 is a longitudinal section of the nut in engagement withthe bolt but before locking, also showing the set by which the nut islocked; Fig. 3 is a similarA view after the nut is locked; Fig. 4 is aplan view of Fig. 3; Fig.

is a bottom plan view of the set.

It is one of the objects of the invention to provide a construction withwhich the nut can be quickly locked and when locked Vwill be securelyheld from accidental disengagement while at the same time it is capableof being removed at any time by the application of sufficient force, andwhen replaced may be again locked. These results are obtained bybeveling off a portion of the threaded end of the bolt and by providingthe nut with an annular tapering flange which, after the nut is 'inengagement with the bolt, may be compressed against said beveled face.Compression will upset the metal, contracting the peripheral length ofthe flange and preventing the turning of the nut unless sufficientpressure is applied to again expand the metal.

In detail, A is the nut provided with a polygonal head, which, asillustrated, is square.

B is the lannular flange formed by cutting away the stock from which thenut is made so as to taper' toward its outer end. The aperture C throughthe nut is threaded, the threads extending through the flange portion aswell as the polygonal portion.

D is the bolt correspondingly threaded to the nut and having a bevelportion E at its Specification of Letters Patent.

Application led September 24, 1908.

Patented Aug. 10, 1909.

seran No. 454,621.

outer end, preferably two of said bevel faces oppositely arranged.

lo facilitate the setting or locking of the nut, I preferably provide asetting tool F which has a recess G in its end for engaging with theflange B of the nut. The walls of this recess G are so formed as tocompress the flange B upon all sides and force it to conform to thecontour of the bolt. Thus the inner end of the recess G is of ovalsection, as indicated at G, Fig. 5, while the onter end, indicated bythe line G2 is circular and of a size to fit the base or longi tudinalend of the flange B. It is therefore apparent that when the set isdriven down over the flange B of the nut it will contract and compel itto conform to the shape of the bolt. W hen the nut is to be removed, theapplication of sufficient turning force will again expand the flange Bso that the threaded portion thereof will conform to the originalsection of the bolt and the nut may then be disengaged. When it isreplaced, it

.may be again set in the same manner as before described.

I/Vhat I claim as my invention is:

l. The combination of a threaded stud having diametrically oppositelybeveled faces removing a portion of the threads, a nut engaging saidstud provided with an annular internally threaded and externally taperedflange, said flange being contracted about the stud to conform to thecontour thereof with the threads flattened against the oppositelybeveled faces.

2. The combination of a threaded stud having a portion of the threadsremoved to' form diametrically opposed flat faces, a nut engaging saidstud provided with an annular tapered flange, said flange beingcontracted about the stud, for the purpose described.

In testimony whereof I aflix my signature in presence oftwo witnesses.

CHARLES ZINOVV.

Witnesses:

NELLIE KINsELLA, JAMES P. BARRY.

